HD643303x Hitachi, HD643303x Datasheet - Page 480
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
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A.3 Number of States Required for Execution
The tables in this section can be used to calculate the number of states required for instruction
execution by the H8/300H CPU. Table A-3 indicates the number of instruction fetch, data
read/write, and other cycles occurring in each instruction. Table A-2 indicates the number of states
required per cycle according to the bus size. The number of states required for execution of an
instruction can be calculated from these two tables as follows:
Number of states = I S
Examples of Calculation of Number of States Required for Execution
Examples: Advanced mode, stack located in external address space, on-chip supporting modules
accessed with 8-bit bus width, external devices accessed in three states with one wait state and
16-bit bus width.
BSET #0, @FFFFFC7:8
JSR @@30
From table A-3, I = L = 2 and J = K = M = N = 0
From table A-2, S
Number of states = 2 4 + 2 3 = 14
From table A-3, I = J = K = 2 and L = M = N = 0
From table A-2, S
Number of states = 2 4 + 2 4 + 2 4 = 24
I
I
= 4 and S
= S
I
+ J S
J
= S
K
J
L
= 4
+ K S
= 3
K
+ L S
465
L
+ M S
M
+ N S
N
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